Spiral Triangles

while surfing through web, one day I came across a nice web page titled ideas.I picked up the ideas over there to implement in the pythonic way and rewrite all code in python.
Todays one is to draw a simple spiral triangles.The basic idea is to start with a triangle, interpolate to find a point a fraction of the way down a side, draw a line to this point, and use that point as the new corner for the triangle. This will make a picture that looks like this:








Complete source code will be as following :

from Tkinter import *
import math

## constant for slope
## and fixed 3 points

ee = 0.04
x1=y1=y2=0
x2=10
x3=5
y3=5*math.sqrt(3)

PrevX = 0
PrevY = 150

## Scales the Line

def scale(x,y,xx,yy):
    x=x*20+100
    y=y*20+100
    xx=xx*20+100
    yy=yy*20+100
    return(x,y,xx,yy)

root = Tk()
root.title("Trigno fun 1")
canvas = Canvas(width=400,height=300,bg='white')
canvas.create_line(scale(x1,y1,x2,y2),fill='red')
canvas.create_line(scale(x2,y2,x3,y3),fill='red')
canvas.create_line(scale(x3,y3,x1,y1),fill='red')

## positions shifted/swapped till 100th point
## using 3 fixed points

for i in range(0,100):
    x4 = ee*x2 + (1-ee)*x3
    y4 = ee*y2 + (1-ee)*y3
    canvas.create_line(scale(x4,y4,x1,y1),fill='red')
    x3=x2
    y3=y2
    x2=x1
    y2=y1
    x1=x4
    y1=y4
    
canvas.pack()
mainloop()

I made few changes in color combination and turn it into following one :